Shares of J.C. Penney (JCP+3.8%) spike higher in late trading after CEO Ron Johnson says the retailer's "Shops" are doing 20% better than the rest of the store. Shares were as high as +11% before it became clearer that the retailer's overall sales could still be subdued with the stores concept still a work in progress. Johnson's comments were made at an Open House Tour event for investors and analysts. (webcast)